<span>Both thought that they had committed a moral and necessary act of defiance. </span>
The correct answer is option two.
An infinitive phrase consists of an infinitive verb, and can be followed by a complement or a modifier, which is usually an adverb.
In the sentence above, the infinitive phrase comes before a complement "variety and interest to their writing."
If this question is from Penn Foster, then your answer should be "<span>from their own point of view"
</span>
